/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/UI/renderer.py
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revision 1219 by bh, Mon Jun 16 17:42:54 2003 UTC revision 2635 by jan, Tue Jun 28 06:48:45 2005 UTC
# Line 1  Line 1 
1  # Copyright (c) 2001, 2002, 2003 by Intevation GmbH  # Copyright (c) 2001-2005 by Intevation GmbH
2  # Authors:  # Authors:
3  # Bernhard Herzog <[email protected]>  # Bernhard Herzog <[email protected]> (2001-2003)
4  # Jonathan Coles <[email protected]>  # Jonathan Coles <[email protected]> (2003)
5  # Frank Koormann <[email protected]>  # Frank Koormann <[email protected]> (2003)
6    # Jan-Oliver Wagner <[email protected]> (2003-2005)
7  #  #
8  # This program is free software under the GPL (>=v2)  # This program is free software under the GPL (>=v2)
9  # Read the file COPYING coming with Thuban for details.  # Read the file COPYING coming with Thuban for details.
10    
11    from __future__ import generators
12    
13  __version__ = "$Revision$"  __version__ = "$Revision$"
14    # $Source$
15    # $Id$
16    
17  import cStringIO  import cStringIO
18    
19    import array
20    
21    import traceback
22    
23  from Thuban import _  from Thuban import _
24    
25  from wxPython.wx import wxMemoryDC, wxEmptyBitmap, \  from wxPython.wx import wxPoint, wxRect, wxPen, wxBrush, wxFont, \
     wxPoint, wxRect, wxPen, wxBrush, wxFont, \  
26      wxTRANSPARENT_PEN, wxTRANSPARENT_BRUSH, \      wxTRANSPARENT_PEN, wxTRANSPARENT_BRUSH, \
27      wxBLACK_PEN, wxRED_PEN, wxBLACK, \      wxBLACK_PEN, wxBLACK, wxSOLID, wxCROSS_HATCH, wxSWISS, wxNORMAL, \
28      wxSOLID, wxCROSS_HATCH, wxSWISS, wxNORMAL, \      wxBitmapFromImage, wxImageFromStream, wxBITMAP_TYPE_BMP, \
29      wxBitmap, wxImageFromBitmap, wxBitmapFromImage, \      wxBITMAP_TYPE_JPEG, wxBITMAP_TYPE_PNG, wxBITMAP_TYPE_TIF, \
30      wxImageFromStream, wxBITMAP_TYPE_BMP      wxBITMAP_TYPE_GIF, wxEmptyImage, wxMask, wxBitmapFromBits
31    
32  from wxproj import draw_polygon_shape, draw_polygon_init  from wxproj import draw_polygon_shape, draw_polygon_init
 from gdalwarp import ProjectRasterFile  
33    
34  from Thuban.UI.common import Color2wxColour  from Thuban.UI.common import Color2wxColour
35  from Thuban.UI.classifier import ClassDataPreviewer  from Thuban.UI.classifier import ClassDataPreviewer
36  from Thuban.UI.scalebar import ScaleBar  from Thuban.UI.scalebar import ScaleBar
37    
38  from Thuban.Model.layer import Layer, RasterLayer, \  from Thuban.Model.data import SHAPETYPE_POLYGON, SHAPETYPE_ARC, \
39       SHAPETYPE_POLYGON, SHAPETYPE_ARC, SHAPETYPE_POINT       SHAPETYPE_POINT, RAW_SHAPEFILE
 from Thuban.Model.label import ALIGN_CENTER, ALIGN_TOP, ALIGN_BOTTOM, \  
      ALIGN_LEFT, ALIGN_RIGHT, ALIGN_BASELINE  
40    
41  from Thuban.Model.classification import Classification  from Thuban.Model.color import Transparent
 from Thuban.Model.color import Color  
42  import Thuban.Model.resource  import Thuban.Model.resource
43    
44  class MapRenderer:  from baserenderer import BaseRenderer
45    
46      """Class to render a map onto a wxDC"""  from math import floor
47    
48      honor_visibility = 1  from types import StringType
49    
50      def __init__(self, dc, scale, offset, resolution = 72.0,  from Thuban.version import versions
                  honor_visibility = None):  
         """Inititalize the renderer.  
   
         dc -- the wxPython DC to render on  
         scale, offset -- the scale factor and translation to convert  
                 between projected coordinates and the DC coordinates  
   
         resolution -- the assumed resolution of the DC. Used to convert  
                 absolute lengths like font sizes to DC coordinates  
   
         honor_visibility -- boolean. If true, honor the visibility flag  
                 of the layers, otherwise draw all layers. If None, use  
                 the renderer's default.  
         """  
         # resolution in pixel/inch  
51    
52          self.dc = dc  if Thuban.Model.resource.has_gdal_support():
53          self.scale = scale      from gdalwarp import ProjectRasterFile
         self.offset = offset  
         if honor_visibility is not None:  
             self.honor_visibility = honor_visibility  
         # store the resolution in pixel/point because it's more useful  
         # later.  
         self.resolution = resolution / 72.0  
   
     def render_map(self, map):  
         self.map = map  
         seenRaster = True  
54    
         if self.scale == 0:  
             return  
55    
56          #  # Map the strings used for the format parameter of the draw_raster_data
57          # This is only a good optimization if there is only one  # method to the appropriate wxWindows constants
58          # raster layer and the image covers the entire window (as  raster_format_map = {
59          # it currently does). We note if there is a raster layer      "BMP": wxBITMAP_TYPE_BMP,
60          # and only begin drawing layers once we have drawn it.      "JPEG": wxBITMAP_TYPE_JPEG,
61          # That way we avoid drawing layers that won't be seen.      "PNG": wxBITMAP_TYPE_PNG,
62          #      "TIFF": wxBITMAP_TYPE_TIF,
63          for layer in map.Layers():      "GIF": wxBITMAP_TYPE_GIF,
64              if isinstance(layer, RasterLayer) and layer.Visible():      }
                 seenRaster = False  
                 break  
   
         for layer in map.Layers():  
             # if honor_visibility is true, only draw visible layers,  
             # otherwise draw all layers  
             if not self.honor_visibility or layer.Visible():  
                 if isinstance(layer, Layer) and seenRaster:  
                     self.draw_shape_layer(layer)  
                 elif isinstance(layer, RasterLayer) \  
                     and Thuban.Model.resource.has_gdal_support():  
                     self.draw_raster_layer(layer)  
                     seenRaster = True  
   
         self.draw_label_layer(map.LabelLayer())  
65    
66      def draw_shape_layer(self, layer):  class MapRenderer(BaseRenderer):
         scale = self.scale  
         offx, offy = self.offset  
67    
68          map_proj = self.map.projection      """Class to render a map onto a wxDC"""
         layer_proj = layer.projection  
   
         shapetype = layer.ShapeType()  
   
         brush = wxTRANSPARENT_BRUSH  
         pen   = wxTRANSPARENT_PEN  
   
         old_prop = None  
         old_group = None  
         lc = layer.GetClassification()  
         field = lc.GetField()  
         defaultGroup = lc.GetDefaultGroup()  
69    
70        TRANSPARENT_PEN = wxTRANSPARENT_PEN
71        TRANSPARENT_BRUSH = wxTRANSPARENT_BRUSH
72    
73          if shapetype != SHAPETYPE_POINT:      def make_point(self, x, y):
74              polygon_render_param = self.polygon_render_param(layer)          return wxPoint(int(round(x)), int(round(y)))
75    
76          if shapetype == SHAPETYPE_POINT:      def tools_for_property(self, prop):
77              draw_func = lambda i: \          fill = prop.GetFill()
78                     self.draw_point_shape(layer, i)          if fill is Transparent:
79                brush = self.TRANSPARENT_BRUSH
80          else:          else:
81              draw_func = lambda i: \              brush = wxBrush(Color2wxColour(fill), wxSOLID)
                    self.draw_polygon_shape(polygon_render_param, i, pen, brush)  
   
         table = layer.ShapeStore().Table()  
         for i in self.layer_ids(layer):  
   
             if field is None:  
                 group = defaultGroup  
             else:  
                 record = table.ReadRowAsDict(i)  
                 assert record is not None  
                 group = lc.FindGroup(record[field])  
   
82    
83              if not group.IsVisible():          stroke = prop.GetLineColor()
84                  continue          if stroke is Transparent:
85                pen = self.TRANSPARENT_PEN
86            else:
87              # don't recreate new objects if they are the same as before              pen = wxPen(Color2wxColour(stroke), prop.GetLineWidth(), wxSOLID)
88              if group is not old_group:          return pen, brush
                 old_group = group  
   
                 prop = group.GetProperties()  
   
                 if prop != old_prop:  
                     old_prop = prop  
89    
90                      if shapetype == SHAPETYPE_ARC:      def low_level_renderer(self, layer):
91                          fill = Color.Transparent          """Override inherited method to provide more efficient renderers
                     else:  
                         fill = prop.GetFill()  
92    
93            If the underlying data format is not a shapefile or the layer
94            contains points shapes, simply use what the inherited method
95            returns.
96    
97            Otherwise, i.e. for arc and polygon use the more efficient
98            wxproj.draw_polygon_shape and its corresponding parameter
99            created with wxproj.draw_polygon_init.
100            """
101            if (layer.ShapeStore().RawShapeFormat() == RAW_SHAPEFILE
102                and layer.ShapeType() in (SHAPETYPE_ARC, SHAPETYPE_POLYGON)):
103                offx, offy = self.offset
104                x = lambda a, b, c, d: None
105                #return (True, x, None)
106                return (True, draw_polygon_shape,
107                        draw_polygon_init(layer.ShapeStore().Shapefile(),
108                                          self.dc, self.map.projection,
109                                          layer.projection,
110                                          self.scale, -self.scale, offx, offy))
111            else:
112                return BaseRenderer.low_level_renderer(self, layer)
113    
114                      if fill is Color.Transparent:      def label_font(self):
115                          brush = wxTRANSPARENT_BRUSH          return wxFont(int(round(self.resolution * 10)), wxSWISS, wxNORMAL,
116                      else:                        wxNORMAL)
117                          color = Color2wxColour(fill)  
118                          brush = wxBrush(color, wxSOLID)      def projected_raster_layer(self, layer, srcProj, dstProj, extents,
119                                   resolution, dimensions, options):
120            """Returns a raster layer image in projected space
121    
122                      stroke = prop.GetLineColor()          Based on a given filename.  This method must be implemented in
123                      stroke_width = prop.GetLineWidth()          classes derived from BaseRenderer.
124                      if stroke is Color.Transparent:          """
                         pen = wxTRANSPARENT_PEN  
                     else:  
                         color = Color2wxColour(stroke)  
                         pen = wxPen(color, stroke_width, wxSOLID)  
125    
126                      if shapetype == SHAPETYPE_POINT:          ret = None
                         self.dc.SetBrush(brush)  
                         self.dc.SetPen(pen)  
127    
128              draw_func(i)          if Thuban.Model.resource.has_gdal_support():
129    
130      def draw_raster_layer(self, layer):              if versions['wxPython-tuple'] < (2,5,3):
131          data = None                  options = options | 4  # INVERT_MASK_BITS
132          offx, offy = self.offset                  options = options & ~2 # ALPHA_MASK not supported
133          width, height = self.dc.GetSizeTuple()  
134                try:
135                    ret = ProjectRasterFile(layer.GetImageFilename(),
136                                            srcProj, dstProj,
137                                            extents, resolution, dimensions,
138                                            options)
139                except (MemoryError, IOError, AttributeError, ValueError):
140                    # Why does this catch AttributeError and ValueError?
141                    # FIXME: The exception should be communicated to the user
142                    # better.
143                    traceback.print_exc()
144    
145            return ret
146    
147        def draw_raster_data(self, x,y, data, format = 'BMP', opacity=1.0):
148    
149            mask = None
150            alpha = None
151            width = data[0]
152            height = data[1]
153            image_data, mask_data, alpha_data = data[2]
154    
155            if versions['wxPython-tuple'] < (2,5,3):
156                alpha_data = None
157    
158            if format == 'RAW':
159                image = wxEmptyImage(width, height)
160                image.SetData(image_data)
161                if mask_data is not None:
162                    mask = wxBitmapFromBits(mask_data, width, height, 1)
163                    mask = wxMask(mask)
164                elif alpha_data is not None:
165                    # alpha_data is already in the right format
166                    alpha = alpha_data
167    
         inProj = ""  
         proj = layer.GetProjection()  
         if proj is not None:  
             for p in proj.GetAllParameters():  
                 inProj += "+" + p + " "  
   
         outProj = ""  
         proj = self.map.GetProjection()  
         if proj is not None:  
             for p in proj.GetAllParameters():  
                 outProj += "+" + p + " "  
   
         xmin = (0 - offx) / self.scale  
         ymin = (offy - height) / self.scale  
         xmax = (width - offx) / self.scale  
         ymax = (offy - 0) / self.scale  
   
         try:  
             data = ProjectRasterFile(  
                 layer.GetImageFilename(),  
                 inProj,  
                 outProj,  
                 (xmin, ymin, xmax, ymax),  
                 "", (width, height))  
         except IOError, (strerr):  
             print strerr  
         except (AttributeError, ValueError):  
             pass  
168          else:          else:
169              if data is not None:              stream = cStringIO.StringIO(image_data)
170                  stream = cStringIO.StringIO(data)              image = wxImageFromStream(stream, raster_format_map[format])
                 image = wxImageFromStream(stream, wxBITMAP_TYPE_BMP)  
                 bitmap = wxBitmapFromImage(image)  
                 self.dc.BeginDrawing()  
                 self.dc.DrawBitmap(bitmap, 0, 0)  
                 self.dc.EndDrawing()  
   
     def layer_ids(self, layer):  
         """Return the shape ids of the given layer that have to be drawn.  
   
         The default implementation simply returns all ids in the layer.  
         Override in derived classes to be more precise.  
         """  
         return range(layer.NumShapes())  
   
     def polygon_render_param(self, layer):  
         """Return the low-lever render parameter for the layer"""  
         offx, offy = self.offset  
         return draw_polygon_init(layer.ShapeStore().Shapefile(), self.dc,  
                                  self.map.projection,  
                                  layer.projection,  
                                  self.scale, -self.scale,  
                                  offx, offy)  
171    
172      def draw_polygon_shape(self, draw_polygon_info, index, pen, brush):              if mask_data is not None:
173          draw_polygon_shape(draw_polygon_info, index, pen, brush)                  stream = cStringIO.StringIO(mask_data)
174                    mask = wxImageFromStream(stream, raster_format_map[format])
175                    mask = wxMask(wxBitmapFromImage(mask, 1))
176                elif alpha_data is not None:
177                    stream = cStringIO.StringIO(alpha_data)
178                    alpha = wxImageFromStream(stream, raster_format_map[format])
179                    alpha = alpha.GetData() #[:] # XXX: do we need to copy this?
180                elif image.HasAlpha():
181                    alpha = image.GetAlphaData()
182    
183      def projected_points(self, layer, index):          #
184          proj = self.map.GetProjection()          # scale down the alpha values the opacity level using a string
185          if proj is not None:          # translation table for efficiency.
186              forward = proj.Forward          #
187          else:          if alpha is not None:
188              forward = None              if opacity == 0:
189          proj = layer.GetProjection()                  return
190          if proj is not None:              elif opacity == 1:
191              inverse = proj.Inverse                  a = alpha
192          else:              else:
193              inverse = None                  tr = [int(i*opacity) for i in range(256)]
194          shape = layer.Shape(index)                  table = array.array('B', tr).tostring()
195          points = []                  a = alpha.translate(table)
         scale = self.scale  
         offx, offy = self.offset  
         for x, y in shape.Points():  
             if inverse:  
                 x, y = inverse(x, y)  
             if forward:  
                 x, y = forward(x, y)  
             points.append(wxPoint(x * scale + offx,  
                                   -y * scale + offy))  
         return points  
   
     def draw_arc_shape(self, layer, index):  
         points = self.projected_points(layer, index)  
         self.dc.DrawLines(points)  
   
     def draw_point_shape(self, layer, index):  
         pp = self.projected_points(layer, index)  
   
         if len(pp) == 0: return # ignore Null Shapes which have no points  
   
         p = pp[0]  
         radius = self.resolution * 5  
         self.dc.DrawEllipse(p.x - radius, p.y - radius, 2*radius, 2*radius)  
196    
197      def draw_label_layer(self, layer):              image.SetAlphaData(a)
         scale = self.scale  
         offx, offy = self.offset  
198    
199          font = wxFont(self.resolution * 10, wxSWISS, wxNORMAL, wxNORMAL)          bitmap = wxBitmapFromImage(image)
         self.dc.SetFont(font)  
200    
201          map_proj = self.map.projection          if mask is not None:
202          if map_proj is not None:              bitmap.SetMask(mask)
             forward = map_proj.Forward  
         else:  
             forward = None  
203    
204          for label in layer.Labels():          self.dc.DrawBitmap(bitmap, int(round(x)), int(round(y)), True)
             x = label.x  
             y = label.y  
             text = label.text  
             if forward:  
                 x, y = forward(x, y)  
             x = x * scale + offx  
             y = -y * scale + offy  
             width, height = self.dc.GetTextExtent(text)  
             if label.halign == ALIGN_LEFT:  
                 # nothing to be done  
                 pass  
             elif label.halign == ALIGN_RIGHT:  
                 x = x - width  
             elif label.halign == ALIGN_CENTER:  
                 x = x - width/2  
             if label.valign == ALIGN_TOP:  
                 # nothing to be done  
                 pass  
             elif label.valign == ALIGN_BOTTOM:  
                 y = y - height  
             elif label.valign == ALIGN_CENTER:  
                 y = y - height/2  
             self.dc.DrawText(text, x, y)  
205    
206    
207  class ScreenRenderer(MapRenderer):  class ScreenRenderer(MapRenderer):
208    
209      # On the screen we want to see only visible layers by default      # On the screen we want to see only visible layers by default
210      honor_visibility = 1      honor_visibility = 1
211        
212      def RenderMap(self, map, region, selected_layer, selected_shapes):      def RenderMap(self, selected_layer, selected_shapes):
213          """Render the map.          """Render the map.
214    
215          Only the given region (a tuple in window coordinates as returned          Only the given region (a tuple in window coordinates as returned
# Line 331  class ScreenRenderer(MapRenderer): Line 217  class ScreenRenderer(MapRenderer):
217          shapes given by the ids in selected_shapes in the          shapes given by the ids in selected_shapes in the
218          selected_layer.          selected_layer.
219          """          """
         self.update_region = region  
220          self.selected_layer = selected_layer          self.selected_layer = selected_layer
221          self.selected_shapes = selected_shapes          self.selected_shapes = selected_shapes
222          self.render_map(map)          self.render_map()
223    
224      def draw_shape_layer(self, layer):      def RenderMapIncrementally(self):
225          MapRenderer.draw_shape_layer(self, layer)          """Render the map.
         if layer is self.selected_layer and self.selected_shapes:  
             pen = wxPen(wxBLACK, 3, wxSOLID)  
             brush = wxBrush(wxBLACK, wxCROSS_HATCH)  
   
             shapetype = layer.ShapeType()  
             if shapetype == SHAPETYPE_POLYGON:  
                 offx, offy = self.offset  
                 renderparam = self.polygon_render_param(layer)  
                 func = self.draw_polygon_shape  
                 args = (pen, brush)  
             elif shapetype == SHAPETYPE_ARC:  
                 renderparam = self.polygon_render_param(layer)  
                 func = self.draw_polygon_shape  
                 args = (pen, None)  
             elif shapetype == SHAPETYPE_POINT:  
                 renderparam = layer  
                 self.dc.SetBrush(brush)  
                 self.dc.SetPen(pen)  
                 func = self.draw_point_shape  
                 args = ()  
             else:  
                 raise TypeError(_("Unhandled shape type %s") % shapetype)  
226    
227              for index in self.selected_shapes:          Only the given region (a tuple in window coordinates as returned
228                  func(renderparam, index, *args)          by a wxrect's asTuple method) needs to be redrawn. Highlight the
229            shapes given by the ids in selected_shapes in the
230            selected_layer.
231            """
232            return self.render_map_incrementally()
233    
234        def draw_selection_incrementally(self, layer, selected_shapes):
235            """Draw the selected shapes in a emphasized way (i.e.
236            with a special pen and brush.
237            The drawing is performed incrementally, that means every
238            n shapes, the user can have interactions with the map.
239            n is currently fixed to 500.
240    
241            layer -- the layer where the shapes belong to.
242            selected_shapes -- a list of the shape-ids representing the
243                               selected shapes for the given layer.
244            """
245            pen = wxPen(wxBLACK, 3, wxSOLID)
246            brush = wxBrush(wxBLACK, wxCROSS_HATCH)
247    
248            shapetype = layer.ShapeType()
249            useraw, func, param = self.low_level_renderer(layer)
250            args = (pen, brush)
251    
252            # for point shapes we need to find out the properties
253            # to determine the size. Based on table and field,
254            # we can find out the properties for object - see below.
255            if shapetype == SHAPETYPE_POINT:
256                lc = layer.GetClassification()
257                field = layer.GetClassificationColumn()
258                table = layer.ShapeStore().Table()
259    
260            count = 0
261            for index in selected_shapes:
262                count += 1
263                shape = layer.Shape(index)
264    
265                # Get the size of the specific property for this
266                # point
267                if shapetype == SHAPETYPE_POINT:
268                    if field is not None:
269                        value = table.ReadValue(shape.ShapeID(), field)
270                        group = lc.FindGroup(value)
271                        size = group.GetProperties().GetSize()
272                    else:
273                        size = lc.GetDefaultSize()
274                    args = (pen, brush, size)
275    
276      def layer_ids(self, layer):              if useraw:
277                    data = shape.RawData()
278                else:
279                    data = shape.Points()
280                func(param, data, *args)
281                if count % 500 == 0:
282                    yield True
283    
284        def layer_shapes(self, layer):
285          """Return the shapeids covered by the region that has to be redrawn          """Return the shapeids covered by the region that has to be redrawn
286    
287          Call the layer's ShapesInRegion method to determine the ids so          Call the layer's ShapesInRegion method to determine the ids so
# Line 386  class ScreenRenderer(MapRenderer): Line 302  class ScreenRenderer(MapRenderer):
302          offx, offy = self.offset          offx, offy = self.offset
303          xs = []          xs = []
304          ys = []          ys = []
305          x, y, width, height = self.update_region          x, y, width, height = self.region
306          for winx, winy in ((x, y), (x + width, y),          for winx, winy in ((x, y), (x + width, y),
307                             (x + width, y + height), (x, y + height)):                             (x + width, y + height), (x, y + height)):
308              px = (winx - offx) / scale              px = (winx - offx) / scale
# Line 406  class ScreenRenderer(MapRenderer): Line 322  class ScreenRenderer(MapRenderer):
322  class ExportRenderer(ScreenRenderer):  class ExportRenderer(ScreenRenderer):
323    
324      honor_visibility = 1      honor_visibility = 1
325        
326      def RenderMap(self, map, region, mapregion,      def __init__(self, *args, **kw):
327                    selected_layer, selected_shapes ):          """Initialize the ExportRenderer.
328    
329            In addition to all parameters of the the ScreenRender
330            constructor, this class requires and additional keyword argument
331            destination_region with a tuple (minx, miny, maxx, maxy) giving
332            the region in dc coordinates which is to contain the map.
333            """
334            self.destination_region = kw["destination_region"]
335            del kw["destination_region"]
336            ScreenRenderer.__init__(self, *args, **kw)
337    
338        def RenderMap(self, selected_layer, selected_shapes):
339          """Render the map.          """Render the map.
340    
341          The rendering device has been specified during initialisation.          The rendering device has been specified during initialisation.
342          The device border distance was set in Thuban.UI.view.OutputTranform().          The device border distance was set in
343                    Thuban.UI.viewport.output_transform().
344    
345          RenderMap renders a frame set (one page frame, one around          RenderMap renders a frame set (one page frame, one around
346          legend/scalebar and one around the map), the map, the legend and the          legend/scalebar and one around the map), the map, the legend and
347          scalebar on the given DC. The map is rendered with the region displayed          the scalebar on the given DC. The map is rendered with the
348          in the canvas view, centered on the area available for map display.          region displayed in the canvas view, centered on the area
349            available for map display.
350          """          """
351            
         self.update_region = region  
352          self.selected_layer = selected_layer          self.selected_layer = selected_layer
353          self.selected_shapes = selected_shapes          self.selected_shapes = selected_shapes
354    
355          # Get some dimensions          # Get some dimensions
356          llx, lly, urx, ury = region          llx, lly, urx, ury = self.region
357          self.mapregion = mapregion          mminx, mminy, mmaxx, mmaxy = self.destination_region
         mminx, mminy, mmaxx, mmaxy = self.mapregion  
358    
359          # Manipulate the offset to position the map          # Manipulate the offset to position the map
360          offx, offy = self.offset          offx, offy = self.offset
361          # 1. Shift to corner of map drawing area          # 1. Shift to corner of map drawing area
362          offx = offx + mminx          offx = offx + mminx
363          offy = offy + mminy          offy = offy + mminy
364    
365          # 2. Center the map on the map drawing area:          # 2. Center the map on the map drawing area:
366          # region identifies the region on the canvas view:          # region identifies the region on the canvas view:
367          # center of map drawing area - half the size of region: rendering origin          # center of map drawing area - half the size of region: rendering origin
368          self.shiftx = (mmaxx - mminx)*0.5 - (urx - llx)*0.5          self.shiftx = (mmaxx - mminx)*0.5 - (urx - llx)*0.5
369          self.shifty = (mmaxy - mminy)*0.5 - (ury - lly)*0.5          self.shifty = (mmaxy - mminy)*0.5 - (ury - lly)*0.5
370    
371          self.offset = (offx+self.shiftx, offy+self.shifty)          self.offset = (offx+self.shiftx, offy+self.shifty)
372            self.region = (llx + self.shiftx, lly + self.shifty, urx, ury)
373    
374          # Draw the map          # Draw the map
375          self.dc.BeginDrawing()          self.dc.BeginDrawing()
376          self.dc.DestroyClippingRegion()          self.dc.DestroyClippingRegion()
377          self.dc.SetClippingRegion(mminx+self.shiftx, mminy+self.shifty,          self.dc.SetClippingRegion(mminx+self.shiftx, mminy+self.shifty,
378                                    urx, ury)                                    urx, ury)
379          self.render_map(map)          self.render_map()
380          self.dc.EndDrawing()          self.dc.EndDrawing()
381    
382          # Draw the rest (frames, legend, scalebar)          # Draw the rest (frames, legend, scalebar)
# Line 459  class ExportRenderer(ScreenRenderer): Line 387  class ExportRenderer(ScreenRenderer):
387          font = wxFont(self.resolution * 10, wxSWISS, wxNORMAL, wxNORMAL)          font = wxFont(self.resolution * 10, wxSWISS, wxNORMAL, wxNORMAL)
388          self.dc.SetFont(font)          self.dc.SetFont(font)
389    
390          self.render_frame(region)          self.render_frame()
391          self.render_legend(map)          self.render_legend()
392          self.render_scalebar(map)          self.render_scalebar()
393          self.dc.EndDrawing()          self.dc.EndDrawing()
394    
395      def render_frame(self, region):      def render_frame(self):
396          """Render the frames for map and legend/scalebar."""          """Render the frames for map and legend/scalebar."""
397    
398          dc = self.dc          dc = self.dc
# Line 473  class ExportRenderer(ScreenRenderer): Line 401  class ExportRenderer(ScreenRenderer):
401    
402          # Dimension stuff          # Dimension stuff
403          width, height = dc.GetSizeTuple()          width, height = dc.GetSizeTuple()
404          mminx, mminy, mmaxx, mmaxy = self.mapregion          mminx, mminy, mmaxx, mmaxy = self.destination_region
405    
406          # Page Frame          # Page Frame
407          dc.DrawRectangle(15,15,width-30, (mmaxy-mminy)+10)          dc.DrawRectangle(15,15,width-30, (mmaxy-mminy)+10)
408            
409          # Map Frame          # Map Frame
410          llx, lly, urx, ury = region          llx, lly, urx, ury = self.region
411          dc.DrawRectangle(mminx + self.shiftx, mminy + self.shifty, urx, ury)          dc.DrawRectangle(mminx + self.shiftx, mminy + self.shifty, urx, ury)
412            
413          # Legend Frame          # Legend Frame
414          dc.DrawRectangle(mmaxx+10,mminy,(width-20) - (mmaxx+10), mmaxy-mminy)          dc.DrawRectangle(mmaxx+10,mminy,(width-20) - (mmaxx+10), mmaxy-mminy)
415    
# Line 489  class ExportRenderer(ScreenRenderer): Line 417  class ExportRenderer(ScreenRenderer):
417          dc.SetClippingRegion(mmaxx+10,mminy,          dc.SetClippingRegion(mmaxx+10,mminy,
418                               (width-20) - (mmaxx+10), mmaxy-mminy)                               (width-20) - (mmaxx+10), mmaxy-mminy)
419    
420      def render_legend(self, map):      def render_legend(self):
421          """Render the legend on the Map."""          """Render the legend on the Map."""
422    
423          previewer = ClassDataPreviewer()          previewer = ClassDataPreviewer()
# Line 499  class ExportRenderer(ScreenRenderer): Line 427  class ExportRenderer(ScreenRenderer):
427    
428          # Dimension stuff          # Dimension stuff
429          width, height = dc.GetSizeTuple()          width, height = dc.GetSizeTuple()
430          mminx, mminy, mmaxx, mmaxy = self.mapregion          mminx, mminy, mmaxx, mmaxy = self.destination_region
431          textwidth, textheight = dc.GetTextExtent("0")          textwidth, textheight = dc.GetTextExtent("0")
432          iconwidth  = textheight          iconwidth  = textheight
433          iconheight = textheight          iconheight = textheight
434          stepy = textheight+3          stepy = textheight+3
435          dx = 10          dx = 10
436          posx = mmaxx + 10 + 5   # 10 pix distance mapframe/legend frame,          posx = mmaxx + 10 + 5   # 10 pix distance mapframe/legend frame,
437                                  # 5 pix inside legend frame                                  # 5 pix inside legend frame
438          posy = mminy + 5        # 5 pix inside legend frame          posy = mminy + 5        # 5 pix inside legend frame
439            
440          # Render the legend          # Render the legend
441          dc.SetTextForeground(wxBLACK)          dc.SetTextForeground(wxBLACK)
442          if map.HasLayers():          if self.map.HasLayers():
443              for l in map.Layers():              layers = self.map.Layers()[:]
444                layers.reverse()
445                for l in layers:
446                  if l.Visible():                  if l.Visible():
447                      # Render title                      # Render title
448                      dc.DrawText(l.Title(), posx, posy)                      dc.DrawText(l.Title(), posx, posy)
449                      posy+=stepy                      posy+=stepy
450                      # Render classification                      if l.HasClassification():
451                      clazz = l.GetClassification()                          # Render classification
452                      shapeType = l.ShapeType()                          clazz = l.GetClassification()
453                      for g in clazz:                          shapeType = l.ShapeType()
454                          if g.IsVisible():                          for g in clazz:
455                              previewer.Draw(dc,                              if g.IsVisible():
456                                  wxRect(posx+dx, posy, iconwidth, iconheight),                                  previewer.Draw(dc,
457                                  g.GetProperties(), shapeType)                                      wxRect(posx+dx, posy,
458                              dc.DrawText(g.GetDisplayText(),                                             iconwidth, iconheight),
459                                          posx+2*dx+iconwidth, posy)                                      g.GetProperties(), shapeType)
460                              posy+=stepy                                  dc.DrawText(g.GetDisplayText(),
461                                                        posx+2*dx+iconwidth, posy)
462      def render_scalebar(self, map):                                  posy+=stepy
463    
464        def render_scalebar(self):
465          """Render the scalebar."""          """Render the scalebar."""
466    
467          scalebar = ScaleBar(map)          scalebar = ScaleBar(self.map)
468    
469          # Dimension stuff          # Dimension stuff
470          width, height = self.dc.GetSizeTuple()          width, height = self.dc.GetSizeTuple()
471          mminx, mminy, mmaxx, mmaxy = self.mapregion          mminx, mminy, mmaxx, mmaxy = self.destination_region
472          
473          # Render the scalebar          # Render the scalebar
474          scalebar.DrawScaleBar(self.scale, self.dc,          scalebar.DrawScaleBar(self.scale, self.dc,
475                               (mmaxx+10+5, mmaxy-25),                               (mmaxx+10+5, mmaxy-25),
476                               ((width-15-5) - (mmaxx+10+5),20)                               ((width-15-5) - (mmaxx+10+5),20)
477                              )                              )
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